题目内容：
Questions How often one hears children wishing they were grown-ups and old people wishing they were 21 again. Each age has its pleasure and its pains, and the happiest person is the one who enjoys what each age 22 him without wasting his time in useless regrets.
Childhood is a time when there are few responsibilities(责任)to make life difficult. If a child has good parents, he is raised, looked after and loved, whatever he may do. It is impossible that he will ever again in his life be given so much without having to do anything in return. What is more, life is always giving new things to the child--things that they have lost their 23 for older people because they are too 24 . But a child has his pains; he is not so free to do what he wishes to do; he is again and again being told not to do something, or being 25 for what he has wrongly done.
When a young man 26 to earn his own living, he can no longer expect others to 27 his food, his clothes and his room but has to work if he wants to live 28 . If he spends most of his time playing about in the ways that he used to as a child, he will 29 hungry. And if he breaks the laws of society 30 he used to break the laws of his parents, he may go to prison. If, however, he works hard, keeps out of trouble and has good health, he can have the great happiness of building up for himself his position in society.
A．children
B．young
C．active
D．strong
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